from django.shortcuts import render
from django.http import HttpResponseRedirect,Http404
from django.core.urlresolvers import reverse
from django.contrib.auth.decorators import login_required
from .models import Topic,Entry
from .forms import TopicForm,EntryForm

# Create your views here.
def index(request):
    '''学习笔记的主页'''
    return render(request,'learning_logsss/index.html')

@login_required
def topics(request):
    '''显示所有的主题'''
    topics = Topic.objects.filter(owner=request.user).order_by('date_added')
    context = {'topics':topics}#dict
    return render(request,'learning_logsss/topics.html',context)

@login_required
def topic(request,topic_id):
    '''显示单个主题及其所有的条目'''
    topic = Topic.objects.get(id=topic_id)
    #确认请求的主题属于当前用户
    if topic.owner != request.user:
        raise Http404
    entries = topic.entry_set.order_by('-date_added')
    context = {'topic':topic,'entries':entries}
    return render(request,'learning_logsss/topic.html',context)

@login_required
def new_topic(request):
    '''添加新主题'''
    if request.method != 'POST':
        #未提交数据：创建一个新表单
        form = TopicForm()

    else:
        #POST提交的数据，对数据进行处理
        form = TopicForm(request.POST)
        if form.is_valid():
            new_topic = form.save(commit=False)
            new_topic.owner = request.user
            new_topic.save()
            return HttpResponseRedirect(reverse('learning_logsss:topics'))


    context = {'form':form}
    return render(request,'learning_logsss/new_topic.html',context)

@login_required
def new_entry(request,topic_id):
    '''在特定的主题下添加新条目'''
    topic = Topic.objects.get(id=topic_id)
    if request.method != 'POST':
        #未提交数据，建立一个空表单
        form = EntryForm()
    else:
        #POST提交的数据，对数据进行处理
        form = EntryForm(data=request.POST)
        if form.is_valid():
            new_entry = form.save(commit=False)
            new_entry.topic = topic
            new_entry.save()
            return HttpResponseRedirect(reverse('learning_logsss:topic',args=[topic_id]))

    context = {'topic':topic,'form':form}
    return render(request,'learning_logsss/new_entry.html',context)

@login_required
def edit_entry(request,entry_id):
    '''编辑现有的条目'''
    entry = Entry.objects.get(id=entry_id)
    topic = entry.topic
    if topic.owner != request.user:
        raise Http404

    if request.method != 'POST':
        #初次请求，使用当前条目填充表单
        form = EntryForm(instance=entry)
    else:
        #POST提交的数据，对数据进行处理
        form = EntryForm(instance=entry,data=request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect(reverse('learning_logsss:topic',args=[topic.id]))

    context = {'entry':entry,'topic':topic,'form':form}
    return render(request,'learning_logsss/edit_entry.html',context)

# @login_required
# def topics(request):
#     '''显示所有主题'''
#
#








